<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
	<style type="text/css">
		*{
			margin: 0;
			padding: 0;
		}
		.box{
			width: 1500px;
			height: 1760px;
			position: relative;
		}
		.top{
			position: sticky;
			top: 0;
			z-index: 5;
		}
		.body{
			display:inline-block;
			position: absolute;
			left: 50%;
			margin-left: -501px;
		}
		.left{
			display:block;
			position: fixed;
			top: 30%;
			left: 0;
		}
		.right{
			display:block;
			position: fixed;
			top: 30%;
			right: 0;
		}
		.ttop{
			width: 100px;
			height: 100px;
			background: skyblue;
			position: fixed;
			right: 0;
			bottom: 10px;
		}
	</style>
</head>
<body>
	<div class="box">
		<img class="top" src="./top.png">
		<img class="left" src="./ad-l.png">
		<img class="body" src="./box.png">
		<img class="right" src="./ad-r.png">
	</div>
	<div class="ttop">
	<a href="#">返回顶部</a>
</div>
</body>
</html>